Copyright © 2005
– 2021 R. STAHL TRANBERG AS. All rights reserved. Page 23 of 38
Chapter V.
Panel
Section 5.01
Overview
Up to 7 panels may be connected to the network. Each panel may have up to 64
buttons, of which three buttons have predefined functions:
Power on/off (turn on or off the panel)
Dimming of backlight
Alarm silence (turns off buzzer)
While the actions on each button may be configured, the actions of the three buttons
listed above cannot be modified.
Hardware
The hardware consists of the following main parts: CPU, W atchdog re set circuitry,
communications, as well as button and led interface components.
CPU
All modules use a dedicated microcontroller with onboard memory.
Power supply
Up to 4 power feeds are possible to the Master CPU, which are connected in parallel via a set of
diodes. From this, a single 24VDC power supply is connected to the panels and output modules.
This combination output forms a common power supply to all connected nodes. The power feed
is supervised by the Master CPU and their states are signaled to all connected nodes via the RS-
485 network.
RS-485 circuitry
The communication circuitry has a built-in snubber circuit which eliminates the need of end
resistor. The transceiver circuit is short circuit safe and is overvoltage protected.